LASORS does have the answer.
Section C2.2
An applicant for a JAR-FCL PPL(H) shall have completed on one type of helicopter, <snip>, the particular requirements specified in (a) and (b) below.
a. 25 hours Dual instruction on Helicopters (must include 5 hours Instrument dual instruction time)
b. 10 hours supervised solo flight time on helicopters, must include:
i. 5 hours Solo cross-country flight time (including solo x-c qualifier).
Therefore, you must fulfil the minimum requirements above in the R44 (ie 35 hours). As I read it, the rest of the 10 hours could be in an R22.